Seat Height Adjustment Actuating Device
An actuating device comprises a handle, a housing, and a driven member connected to the handle, the driven member being rotatable about a longitudinal axis thereof, the housing containing: a brake mechanism, for restricting rotation of the driven member when the brake mechanism is engaged; a means for disengaging the brake mechanism; a means for rotating the driven member in either the clockwise or counter-clockwise direction; and, a clutch mechanism for restricting reverse rotation of the driven member when driven in the clockwise or counter-clockwise direction. The actuating device of the invention is particularly suited for actuating a seat height adjustment mechanism of a vehicle.
Latest Eurospec Manufacturing Inc. Patents:
The present application claims priority to U.S. Application No. 61/506,396, filed on Jul. 11, 2011, the entire contents of which are incorporated herein by reference.
FIELD OF THE INVENTIONThe present invention relates to manual seat lift devices, particularly for use in vehicles. More specifically, the invention relates to a seat lift device having clutch and brake mechanisms for actuating a seat height adjusting device a motor vehicle seat assembly.
BACKGROUND OF THE INVENTIONThe seats in a motor vehicle, in particular the driver's seat, are typically provided with some device for adjusting the position thereof so as to ensure that the seat is at the desired height for the driver's visibility and at the desired spacing from the steering wheel and pedals. Many seats are also provided with other comfort settings that can also be adjusted. The adjusting devices can be either manual or powered by one or more motorized mechanisms. Motor vehicle seats are commonly formed with a frame, onto which the cushions and upholstery etc. are provided. Height adjustment devices are typically mounted to the frame so as to allow the entire seat assembly to be raised or lowered as needed.
Various devices and mechanisms are known in the art for manually adjusting the height of seats in vehicles. Generally, such devices comprise a manual actuator, such as a spring activated lever, that is connected to a seat height adjustment mechanism provided in a seat assembly. Such actuators are generally provided with a clamping or braking mechanism, for locking the height adjustment mechanism so as to position the seat at a desired height. The occupant of the seat engages the actuator to release the clamp or brake, adjusts the seat to a desired height, and releases the actuator to clamp the seat in the desired position. It is also common for such manual actuating devices to include a clutch mechanism to facilitate the height adjustment process by preventing the weight of the passenger from acting against the actuator. Examples of known manual seat adjustment devices and actuators are provided in the following documents: U.S. Pat. No. 4,648,575 (Kawade); U.S. Pat. No. 6,212,965 (Hochmuth); U.S. Pat. No. 7,182,196 (Weber); and US 2007-0227854 (Cabrit).
Some of the known manual seat height actuators or devices utilize a friction-based mechanism for achieving the required clamping forces. In such known devices, a number of balls, i.e. ball bearings (U.S. Pat. No. 6,212,965) or rollers (US 2007-0227854) are forced by springs into a space or channel bounded by two members. Once the balls are frictionally engaged into such channel, relative movement between the two members is prevented.
The mechanisms used in many known devices for raising and lowering of seats tend to be clumsy, cumbersome and difficult to operate. The known devices are also generally expensive (due, for example, to the use of machined components) and are either large and/or heavy, which are undesirable characteristics when manufacturing vehicles having cost constraints, and space and weight restrictions.
The present invention seeks to alleviate one or more of the drawbacks of the known seat height actuating devices.
SUMMARY OF THE INVENTIONIn one aspect, the present invention provides a seat height adjusting device, which comprises a handle such as a lever or a rod etc., and a pinion gear or other such rotatable component that is adapted to engage a seat height adjustment mechanism of a seat assembly to raise or lower same. When the handle is in a neutral position, the device is maintained in a “brake” mode, wherein the pinion gear is not rotatable. In the brake mode, a brake mechanism of the device is engaged, and which prevents rotation of the pinion gear. The handle is adapted to be rotated in either the clockwise or counter-clockwise directions, preferably over a defined arc. Rotation of the handle actuates a clutch mechanism and disengages the brake mechanism. In turn, the rotation of the handle is translated to a rotation of the pinion gear.
In a preferred embodiment, one or both of the brake and clutch mechanisms utilize a number of ball bearings that are used to transfer rotational forces from the handle to other components so as to actuate the brake and clutch mechanisms. In one aspect, the ball bearings transfer such rotational forces by frictional contact between a rotating member, driven by the handle, to adjacent drums, such as a clutch drum and brake drum. The frictional contact is produced by wedging the ball bearings against the respective drums. In a preferred embodiment, the drums are provided with tapered or deformed portions to create the required wedges.
Thus, in one aspect, the present invention provides an actuating device comprising a rotatable handle and a rotatable driven member driven by the handle, wherein the device further comprises:
- a brake mechanism for preventing rotation of the driven member;
- a means for disengaging the brake mechanism and for allowing rotation of the driven member in either the clockwise or counter-clockwise direction; and,
- a clutch mechanism for preventing reverse rotation of the driven member while being rotated.
In another aspect, the invention provides actuating device comprising a handle, a housing, and a driven member connected to the handle, the driven member being rotatable about a longitudinal axis thereof, the housing containing:
- a brake mechanism, for restricting rotation of the driven member when the brake mechanism is engaged;
- a means for disengaging the brake mechanism;
- a means for rotating the driven member in either the clockwise or counter-clockwise direction; and,
- a clutch mechanism for restricting reverse rotation of the driven member when driven in the clockwise or counter-clockwise direction.
In another aspect, the brake mechanism of the actuating device comprises:
- a brake drum and a hub, the brake drum and hub being generally coaxially aligned and wherein the brake drum has a larger radius than the hub; and,
- a plurality of brake rotating members positioned between the hub and the brake drum, the brake rotating members being in frictional contact with an outer surface of the hub and an inner surface of the brake drum.
In another aspect, the clutch mechanism comprises:
- a driver drum and a clutch drum, the driver drum and clutch drum being generally coaxially aligned, and wherein the driver drum has a larger radius than the clutch drum; and,
- a plurality of clutch rotating members positioned between the driver drum and the clutch drum, the clutch rotating members being in frictional contact with an inner surface of the driver drum and an outer surface of the clutch drum.
In one aspect, the brake and clutch rotating members comprise ball bearings or rollers. In another aspect, the clutch rotating members are constrained within a cage.
In one aspect, the handle includes a motion translating means for translating motion of the handle to the driver drum. In another aspect, the clutch drum includes a motion translation means for translating motion of the clutch drum to the brake drum.
The features of the invention will become more apparent in the following detailed description in which reference is made to the appended drawings wherein:
This present invention relates to a manual seat lift height adjusting device that controls or actuates a height adjusting mechanism of a seat assembly (i.e. the frame, cushions, springs etc. that form a vehicle seat). One example of a height adjustment mechanism provided on a seat assembly is shown in U.S. Pat. No. 4,648,575. It will be understood that the present invention is not limited to any particular height adjustment. The actuating mechanism of the present invention actuates the height adjustment mechanism of a seat assembly to raise or lower the seat assembly. It will be understood by persons skilled in the art that the springs, levers and other mechanisms that cause the raising or lowering of a seat are typically provided within the seat assembly and that such devices/mechanisms are known in the art. Thus, the device of the invention provides a means for actuating such height adjustment mechanisms of a seat assembly. Therefore, the terms “device” or “seat lift height adjustment mechanism” etc., as used herein with reference to the present invention, will be understood to mean the actuating means that connects to a further mechanism provided in a seat assembly.
Referring to
As shown for example in
As shown in, for example
The device is provided with a number of bolts 12 that secure the device 100 to a seat assembly. More particularly, the bolts 12 serve to secure the device 100 to the frame portion of the seat assembly. In the illustration shown in the enclosed figures, three, generally equidistantly spaced bolts 12 are used; however, it will be understood that any number bolts may be used with the invention. Similarly, although bolts 12 may be preferred, it will be understood that any other connecting means may be used for the same purpose of connecting the device 100 to a seat assembly.
A pinion gear 1 extends through the inner plate cover 5 and serves as the drive means that connects the device, or actuator, 100 of the invention to a seat height adjustment mechanism provided in the seat assembly. In general, and as discussed further below, rotation of the handle plate 6 results in rotation of the pinion gear 1, which, in turn, actuates the height adjustment mechanism of the seat assembly. As shown in
As described further below, the outer cup 7 serves as an enclosure for containing brake and clutch mechanisms to assist in controlling the motion of the pinion gear 1.
The pinion gear 1 is held in place with respect to a brake drum 19 by means of a slotted feature, as shown in
The seat height actuating device 100 is operated by the user moving the handle portion 24 of the handle plate 6, which drives handle plate rivets 10 that are fastened to a driver drum 11. The driver drum 11, with and without handle plate rivets 10 is shown in
As shown for example in
A clutch sub-assembly according to an aspect of the invention is provided by including between the driver drum 11 and the clutch drum 14, the assembly shown in
In the embodiment illustrated in the accompanying figures, three pairs of clutch ball bearings 17 are provided. In the result, three clutch springs 16 are provided between each pair and three separators 47 are provided to separate adjacent pairs of ball bearings 17. It will be understood that the invention is not limited to this number of ball bearings and that any number of pairs of ball bearings 17 may be used. It will also be understood that the number of springs 16 and separators will be adjusted accordingly. For example, it may be preferred to incorporate six pairs of ball bearings 17 in order to provide a desired level of force. Such an embodiment is illustrated in
The clutch mechanism of the present invention will now be described with reference to the clutch sub-assembly discussed above. As shown in
As discussed above, the driver drum 11 is driven by the handle of the handle plate 6. As will be understood, once the handle is released, it is returned to its neutral position by means of the spring (i.e. torsion spring) 8.
A brake sub-assembly according to an aspect of the invention is provided by including between the brake drum 19 and the brake hub 2, a number of spring biased brake ball bearings 18. The ball bearings are biased apart with brake springs 3. The arrangement of brake ball bearings 18 is shown in isolation in
The operation of brake mechanism of the invention will now be described with reference to
As shown in
As shown in
As can be seen in for example
As will be understood from the above description of the device 100, rotation of the handle plate 6 drives the following:
- rotation of the driver drum 11, due to engagement of the handle plate 6 with the handle plate rivets 10, which may also be referred to as “motion translation means”;
- one of each of the pairs of clutch ball bearings 17 (dependent upon the direction in which the handle plate 6 is rotated), due to frictional engagement of the clutch ball bearings 17 with the driver drum 11;
- the clutch drum 14, due to frictional engagement of the clutch drum 14 with the clutch ball bearings 17;
- one of each of the pairs of brake ball bearings 18 (dependent upon the direction in which the handle plate 6 is rotated), due to frictional engagement of the brake ball bearings and the clutch drum 14;
- and the brake drum 19, due to the engagement of the tabs 50 of the clutch drum 14 and the slots 48 of the brake drum 19, wherein the tabs 50 may be referred to as “motion translation means”.
In the result, it will be understood that the movement of the handle plate 6 causes the release of the brake mechanism of the device, to allow rotation of the pinion gear 1 in one direction, but also causes the clutch mechanism of the device to become engaged to prevent the pinion gear 1 from rotating in the opposite direction.
Once the handle plate 6 reaches its maximum rotation distance, it can be released, which would allow the torsion spring 8 to return the handle plate 6 to its neutral position, wherein the device 100 re-enters the “brake” mode.
In the above description, reference has been made to “ball bearings” for use in the clutch and brake mechanisms. However, it will be understood that this term is also intended to include other types of rollers or rolling members as known in the art.
The device described herein is particularly suited for connecting to and actuating any seat lift height adjusting mechanism provided on seat assembly. In particular, the present device is well suited for use in vehicles. However, as will be understood by persons skilled in the art, the use of the present device with vehicle seat height adjustment mechanisms is a preferred embodiment of the invention and that the present device may be used with any other mechanism that is actuated by a rotating member.
In one aspect of the invention, the various components described herein are designed to be suitable for manufacturing by known stamping processes. As will be understood by persons skilled in the art, such advantage results in reduced production costs for the device of the invention. The components of the invention that are particularly suited for manufacture by stamping methods include the handle plate 6, the driver drum 11, the clutch drum 14 and the brake drum 19. However, it will be understood that other components of the invention may also be manufactured by known, low cost methods.
Further, the device of the invention provides the required brake and clutch mechanisms as a relatively compact and low weight component, thereby overcoming the constraints of providing the device inside a vehicle environment.
Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without departing from the purpose and scope of the invention as outlined in the claims appended hereto. Any examples provided herein are included solely for the purpose of illustrating the invention and are not intended to limit the invention in any way. Any drawings provided herein are solely for the purpose of illustrating various aspects of the invention and are not intended to be drawn to scale or to limit the invention in any way. The disclosures of all prior art recited herein are incorporated herein by reference in their entirety.
Claims
1. An actuating device comprising a handle, a housing, and a driven member connected to the handle, the driven member being rotatable about a longitudinal axis thereof, the housing containing:
- a brake mechanism, for restricting rotation of the driven member when the brake mechanism is engaged;
- a means for disengaging the brake mechanism;
- a means for rotating the driven member in either the clockwise or counter-clockwise direction; and,
- a clutch mechanism for restricting reverse rotation of the driven member when driven in the clockwise or counter-clockwise direction.
2. The actuating device of claim 1, wherein motion of the handle is translated to the driven member through a plurality of members generally coaxially aligned and in frictional engagement.
3. The actuating device of claim 2, wherein the frictional engagement is provided by ball bearings or rollers provided between adjacent rotating members.
4. The actuating device of claim 3, wherein the ball bearings or rollers are provided in pairs and wherein each pair of ball bearings or springs is separated by a respective biasing member.
5. The actuating device of claim 4, wherein the biasing members are springs.
6. The actuating device of claim 1, wherein the clutch mechanism comprises:
- a driver drum and a clutch drum, the driver drum and clutch drum being generally coaxially aligned, and wherein the driver drum has a larger radius than the clutch drum; and,
- a plurality of clutch rotating members positioned between the driver drum and the clutch drum, the clutch rotating members being in frictional contact with an inner surface of the driver drum and an outer surface of the clutch drum.
7. The actuating device of claim 6, wherein the handle includes a motion translating means for translating motion of the handle to the driver drum.
8. The actuating device of claim 6, wherein the clutch rotating members are ball bearings or rollers.
9. The actuating device of claim 6, wherein the clutch rotating members are provided in pairs and wherein each pair of rotating members is biased apart by a respective biasing means.
10. The actuating device of claim 9, wherein the biasing means comprise springs.
11. The actuating device of claim 6, wherein the clutch rotating members are constrained within a carriage.
12. The actuating member of claim 6, wherein the driver drum is provided with a plurality of inward deformations for frictionally engaging the clutch rotating members.
13. The actuating device of claim 6, wherein the brake mechanism comprises:
- a brake drum and a hub, the brake drum and hub being generally coaxially aligned and wherein the brake drum has a larger radius than the hub; and,
- a plurality of brake rotating members positioned between the hub and the brake drum, the brake rotating members being in frictional contact with an outer surface of the hub and an inner surface of the brake drum.
14. The actuating device of claim 13, wherein the clutch drum includes a motion translation means for translating motion of the clutch drum to the brake drum.
15. The actuating device of claim 13, wherein the brake rotating members are ball bearings or rollers.
16. The actuating device of claim 13, wherein the brake rotating members are provided in pairs and wherein each pair of brake rotating members is biased apart by a respective biasing means.
17. The actuating device of claim 16, wherein the biasing means comprise springs.
18. The actuating member of claim 13, wherein the brake drum is provided with a plurality of inward deformations for frictionally engaging the brake rotating members.
19. The actuating device of claim 1, wherein the handle is biased by a handle biasing member for returning the handle to a neutral position.
20. The actuating device of claim 1, wherein the driven member is adapted for connection to a seat height adjustment mechanism of a vehicle.
Type: Application
Filed: Jul 11, 2012
Publication Date: Jan 17, 2013
Patent Grant number: 8882198
Applicant: Eurospec Manufacturing Inc. (Newmarket)
Inventors: Russel Vincent Gillis (Schomberg), Edilbert Delgado Yu (Ajax)
Application Number: 13/546,929